body{
    font-size: 14px;
    font-family: 微软雅黑;
}
.banner{
    height: 500px;
}
.banner1{
    background: url("../img/banner.jpg");
    background-size: cover;
}
.banner2{
    background: url("../img/banner2.jpg");
    background-size: cover;
}
.banner3{
    background: url("../img/banner3.jpg");
    background-size: cover;
}
main{
    background: url("../img/banner4.jpg");
    padding-top: 10px;
}
.card-img-top{
    margin: 5px auto;
    width: 95%;
}
footer{
    background: #ffffff;
    padding: 20px;
}
footer a:hover{
    text-decoration: none;
}

/*响应式*/
@media (max-width: 600px) {
    .banner{
        height: 230px;
    }
}

/*网站的内容部分*/
.card .card-text{
    height: 30px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}